Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thanh lap » thanh san, phan lap, thanh hai
sang tao » hang tai
va thanh » gia thanh, ban thanh, va tinh
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, tay hoi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thuat
thuc va » thuc vat, thuc dan, thuc day
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky sang tao hoi. hieu va tham thuc va thanh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao hoi. hieu va tham thuc va thanh lap ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao hoi. hieu va tham thuc va thanh lap ((dua tren) or (cua te))*.